I have been using a Varmint Kevlar in 223 for several years now, and it is easily my favorite rifle. I prefer the 5rd mags, and dont understand the desire for reduced capacity flush mount mags, but to each their own. The HS stock is amazing, if a little short. I greatly prefer synthetic to wood stocks for a working gun, and cant think of a better one than what CZ chose.
Mine is one of the older 1:12 guns, and it absolutely loves 50gr V-Max. It has been Ackley'd, and shortened to an 18" barrel. It currently wears a 3-9x Leupold Mark AR on a DIP Extended picatinny base.
In a previous life, this gun wasnt treated real well, and has a bad spot in the barrel. About 3/4" 5-shot groups are about as good as it will do, but 1" groups are the norm. I am shoving the 50s at about 3510fps out of that sort tube, and its absolute death on anything within 300yd.